Effects of baria on propane oxidation activity of Pd/Al2O3 catalyst: Pd–BaO interactio n and reaction routes |
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作者姓名: | Min Li Xiaodong Wu Shuang Liu Jie Wan Rui Ran Duan Weng |
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作者单位: | Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University |
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基金项目: | financial support of the Ministry of Science and Technology of China(Project nos.2010CB732304 and 2013AA065302);National Natural Science Foundation of China(Project no.51202116) |
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摘 要: | The BaO-modified Pd/Al2O3exhibits much better catalytic activity than Pd/Al2O3for C3H8 oxidation both before and after the hydrothermal aging treatment. Further studies ascribe its good activity to the influence of BaO species on the physicochemical characteristics of the catalyst and the reaction routes. Firstly, the BaO species inhibits the phase transformation of alumina, resulting in higher surface area of the catalysts and hereby a better dispersion of Pd. Secondly, the basic nature and electron-withdrawing effect of barium oxide maintain palladium at high oxidation state, which leads to a higher PdO content on surface of the BaO-modified catalyst. Finally, the formation/decomposition of carbonate/bicarbonate species can be promoted by the addition of BaO, which provide extra reaction routes and are important for the deep oxidation of C3H8.
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关 键 词: | Pd/Al2O3 C3H8combustion Hydrothermal aging BaO modification Surface PdO content |
收稿时间: | 14 January 2014 |
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